PURPOSE: To incorporate terminals of a crystal oscillation integrated circuit into one and to reduce the cost by providing an amplifier feeding back its output signal straightforward to a noninverting input and connecting its inverting input terminal to an inverting input and a crystal oscillator whose one terminal is connected to the inverting input terminal or the amplifier and whose other terminal is connected to ground.
CONSTITUTION: An amplifier 1 whose output signal is fed back straightforward to its noninverting input and whose output signal is connected to its inverting input via an impedance circuit 2 and a series circuit comprising a resistor R and a capacitor C connected in parallel with the impedance circuit 2, and a crystal oscillator 3 whose one terminal is connected to the inverting input of the amplifier 1 and whose other end is connected to ground, are provided in the circuit. Thus, in case of integrating the crystal oscillation circuit, one terminal is enough for the circuit, and since no reference potential point is required because the output of the amplifier 1 is given to the noninverting input and the inverting input of the amplifier 1, the circuit constitution is simplified.
YOSHIMURA KOICHI
IMAI HIROYOSHI
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